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Response: See Figure #2, NHMC/NHP System
Messages
4. Max. Filling Time - Error 3
Symptom(s) Diagnosed:
Time dependent.
Neither Maximal Level (full cylinder) is detected,
nor is there enough current drawn to meet
capacity demand. Current monitored on primary
lead to cylinder is greater than zero and not
decreasing. The unit will have tried to self-correct
prior to system shutdown by pulse activating the
drain valve to possibly clear any debris holding the
drain valve open.
Probable Cause(s):
1. Steam line restriction causing back pressure.
2. Improper fill rate.
3. Leaking drain valve
4. Full cylinder not detected.
Unit Takes Self-Corrective Action:
Yes. It
pulse-activates the drain valve to possibly clear
any dirt. It retests. If the symptoms persist after
two attempts, it then responds as shown in Figure
#2.
Corrective Action:
1. Check for water leaking from drain. If present,
correct the drain valve deficiency (check for debris
holding drain coil plunges open).
2. Ensure the steam line, from the cylinder outlet to
the steam distributor (duct or blower pack), is
properly installed, to ensure back pressure is not
the case.
3. Check water level in cylinder.
4. If full reset unit and ensure there is a demand for
steam (the green LED on unit door will stay
illuminated. Maximal Level should be indicated on
the LCD display and both green and yellow LED is
on the unit door illuminate almost immediately. If
Maximal Level is not indicated, a problem exists
with the high water sensor circuitry.
a) Check wiring of the high water sensor PCB
(refer to unit wiring diagram).
b) Check for amperage on all wires at the
cylinder, with an amp probe (amp clamp). If
amperage is not detected on all wires,
correct primary wiring deficiency. If
amperage is detected on all wires, proceed
to next step.
c) Place a jumper across 42 and 48 of main
PCB for five seconds. If Maximal Level is not
displayed and the fill valve does not energize (green
LED must be illuminated), the main PCB is defective.
If Maximal level is displayed, a problem exists with
the cylinder or the high water sensor PCB. A voltage
of 85 VAC or greater across the orange wires of the
high water PCB ( one orange wire terminates at the
white sensor plug attached to the soldered pin of the
cylinder, the other terminates at one of the contactor
connections) will signal a full cylinder (Maximal
Level) to the main pcb. If this voltage does exist, the
problem is with the high water PCB, if not, the
problem is within the cylinder (can be caused by
cylinder being past end of life.
5. If not full, drain cylinder, reset unit, and check the
fill rate (refer to Figure #2 ). If the fill rate is
correct, back pressure is the likely cause and
should be rechecked.
Response:
See Figure #2, NHMC/NHP System
Messages.
5. Cylinder Spent - Error 4
Symptom(s) Diagnosed: Water level stays high,
cycling on and off Maximal Level (full cylinder),
without an increase in output/amp draw or
reaching demand.
Probable Cause(s):
1. Cylinder has reached end of life due to insulative
mineral coating on electrodes.
2. New cylinder start up with low incoming water
conductivity.
Corrective Action:
1. If the cylinder is not new, replace the cylinder
immediately. Within approximately three days, the
unit will shut itself down on Error 9 resulting in no
output instead of reduced output.
2. If the cylinder is new, the electronics will
differentiate cylinder spent from new cylinder start
up and the displayed error will discontinue without
a shutdown on Error 9.
Response:
See Figure #2, NHMC/NHP System
Messages.
6. No Current - Error 5
Symptom(s) Diagnosed:
Time dependent. No
current sensed by the electronics on the monitored
primary lead to the cylinder. The unit will have
tried to self correct prior to system shutdown by
pulse activating the drain valve, to possibly clear
any debris holding the drain valve open.
Probable Cause(s):
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